func parallaxMotion()
{
let min = CGFloat(-30)
let max = CGFloat(30)
let xMotion = UIInterpolatingMotionEffect(keyPath: "layer.transform.translation.x", type: .tiltAlongHorizontalAxis)
xMotion.minimumRelativeValue = min
xMotion.maximumRelativeValue = max
let yMotion = UIInterpolatingMotionEffect(keyPath: "layer.transform.translation.y", type: .tiltAlongVerticalAxis)
yMotion.minimumRelativeValue = min
yMotion.maximumRelativeValue = max
let motionEffectGroup = UIMotionEffectGroup()
motionEffectGroup.motionEffects = [xMotion,yMotion]
self.ivBackground.addMotionEffect(motionEffectGroup)
}
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